Clypeal suture: marks the division between clypeus and epicranium.
Protocranium: the posterior part of the epicranium: sometimes used as Occiput.
Epicranial plate: in some larvae a plate-like structure forming the epicranium.
The head is extended from behind forwards, so that the crown (epicranium) is large, while the face (clypeus) is small.
Above is the crown (vertex or epicranium), on which or on the “front” may be seated three simple eyes (ocelli).
epicranium ep·i·cra·ni·um (ěp'ĭ-krā'nē-əm)
n. pl. ep·i·cra·ni·ums or ep·i·cra·ni·a (-nē-ə)
The structures covering the cranium.